Waste in East Anglian town I disposed of, having secured parking (9)
I believe the answer is:
dissipate
'waste' is the definition.
(dissipating is a kind of wasting)
'east anglian town i disposed of having secured parking' is the wordplay.
'east anglian town' becomes 'diss' (I've seen this before).
'disposed of' becomes 'ate'.
'having secured' means one lot of letters goes inside another.
'parking' becomes 'p'.
'i'+'ate'='iate'
'iate' going around 'p' is 'ipate'.
'diss'+'ipate'='DISSIPATE'
'in' is the link.
(Other definitions for dissipate that I've seen before include "Exhaust" , "drive away" , "Be dispelled/dispersed" , "Waste (money/energy)" , "Fritter away" .)